Re: question about photons


<luckyvomit@xxxxxxxxx> wrote in message
news:1114219991.597289.60410@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> The current age of the universe is estimated to be 14 billion years.
> How old does the universe 'appear' to a photon of light
>
> thanks

The photon isn't a valid frame of reference, but,
asymptotically, photon proper time is stuck at zero.

[Old Man]



.

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